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29 * @(#)vmmeter.h 8.2 (Berkeley) 7/10/94
33 #ifndef _SYS_VMMETER_H_
34 #define _SYS_VMMETER_H_
37 * This value is used by ps(1) to change sleep state flag from 'S' to
38 * 'I' and by the sched process to set the alarm clock.
43 * System wide statistics counters.
45 * a - locked by atomic operations
46 * c - constant after initialization
47 * f - locked by vm_page_queue_free_mtx
48 * p - locked by being in the PCPU and atomicity respect to interrupts
49 * q - locked by vm_page_queue_mtx
53 * General system activity.
55 u_int v_swtch; /* (p) context switches */
56 u_int v_trap; /* (p) calls to trap */
57 u_int v_syscall; /* (p) calls to syscall() */
58 u_int v_intr; /* (p) device interrupts */
59 u_int v_soft; /* (p) software interrupts */
61 * Virtual memory activity.
63 u_int v_vm_faults; /* (p) address memory faults */
64 u_int v_cow_faults; /* (p) copy-on-writes faults */
65 u_int v_cow_optim; /* (p) optimized copy-on-writes faults */
66 u_int v_zfod; /* (p) pages zero filled on demand */
67 u_int v_ozfod; /* (p) optimized zero fill pages */
68 u_int v_swapin; /* (p) swap pager pageins */
69 u_int v_swapout; /* (p) swap pager pageouts */
70 u_int v_swappgsin; /* (p) swap pager pages paged in */
71 u_int v_swappgsout; /* (p) swap pager pages paged out */
72 u_int v_vnodein; /* (p) vnode pager pageins */
73 u_int v_vnodeout; /* (p) vnode pager pageouts */
74 u_int v_vnodepgsin; /* (p) vnode_pager pages paged in */
75 u_int v_vnodepgsout; /* (p) vnode pager pages paged out */
76 u_int v_intrans; /* (p) intransit blocking page faults */
77 u_int v_reactivated; /* (f) pages reactivated from free list */
78 u_int v_pdwakeups; /* (f) times daemon has awaken from sleep */
79 u_int v_pdpages; /* (q) pages analyzed by daemon */
81 u_int v_tcached; /* (p) total pages cached */
82 u_int v_dfree; /* (p) pages freed by daemon */
83 u_int v_pfree; /* (p) pages freed by exiting processes */
84 u_int v_tfree; /* (p) total pages freed */
86 * Distribution of page usages.
88 u_int v_page_size; /* (c) page size in bytes */
89 u_int v_page_count; /* (c) total number of pages in system */
90 u_int v_free_reserved; /* (c) pages reserved for deadlock */
91 u_int v_free_target; /* (c) pages desired free */
92 u_int v_free_min; /* (c) pages desired free */
93 u_int v_free_count; /* (f) pages free */
94 u_int v_wire_count; /* (a) pages wired down */
95 u_int v_active_count; /* (q) pages active */
96 u_int v_inactive_target; /* (c) pages desired inactive */
97 u_int v_inactive_count; /* (q) pages inactive */
98 u_int v_cache_count; /* (f) pages on cache queue */
99 u_int v_cache_min; /* (c) min pages desired on cache queue */
100 u_int v_cache_max; /* (c) max pages in cached obj */
101 u_int v_pageout_free_min; /* (c) min pages reserved for kernel */
102 u_int v_interrupt_free_min; /* (c) reserved pages for int code */
103 u_int v_free_severe; /* (c) severe page depletion point */
105 * Fork/vfork/rfork activity.
107 u_int v_forks; /* (p) fork() calls */
108 u_int v_vforks; /* (p) vfork() calls */
109 u_int v_rforks; /* (p) rfork() calls */
110 u_int v_kthreads; /* (p) fork() calls by kernel */
111 u_int v_forkpages; /* (p) VM pages affected by fork() */
112 u_int v_vforkpages; /* (p) VM pages affected by vfork() */
113 u_int v_rforkpages; /* (p) VM pages affected by rfork() */
114 u_int v_kthreadpages; /* (p) VM pages affected by fork() by kernel */
118 extern struct vmmeter cnt;
121 * Return TRUE if we are under our severe low-free-pages threshold
123 * This routine is typically used at the user<->system interface to determine
124 * whether we need to block in order to avoid a low memory deadlock.
129 vm_page_count_severe(void)
131 return (cnt.v_free_severe > (cnt.v_free_count + cnt.v_cache_count));
135 * Return TRUE if we are under our minimum low-free-pages threshold.
137 * This routine is typically used within the system to determine whether
138 * we can execute potentially very expensive code in terms of memory. It
139 * is also used by the pageout daemon to calculate when to sleep, when
140 * to wake waiters up, and when (after making a pass) to become more
146 vm_page_count_min(void)
148 return (cnt.v_free_min > (cnt.v_free_count + cnt.v_cache_count));
152 * Return TRUE if we have not reached our free page target during
153 * free page recovery operations.
158 vm_page_count_target(void)
160 return (cnt.v_free_target > (cnt.v_free_count + cnt.v_cache_count));
164 * Return the number of pages we need to free-up or cache
165 * A positive number indicates that we do not have enough free pages.
170 vm_paging_target(void)
173 (cnt.v_free_target + cnt.v_cache_min) -
174 (cnt.v_free_count + cnt.v_cache_count)
179 * Returns TRUE if the pagedaemon needs to be woken up.
184 vm_paging_needed(void)
187 (cnt.v_free_reserved + cnt.v_cache_min) >
188 (cnt.v_free_count + cnt.v_cache_count)
194 /* systemwide totals computed every five seconds */
196 int16_t t_rq; /* length of the run queue */
197 int16_t t_dw; /* jobs in ``disk wait'' (neg priority) */
198 int16_t t_pw; /* jobs in page wait */
199 int16_t t_sl; /* jobs sleeping in core */
200 int16_t t_sw; /* swapped out runnable/short block jobs */
201 int32_t t_vm; /* total virtual memory */
202 int32_t t_avm; /* active virtual memory */
203 int32_t t_rm; /* total real memory in use */
204 int32_t t_arm; /* active real memory */
205 int32_t t_vmshr; /* shared virtual memory */
206 int32_t t_avmshr; /* active shared virtual memory */
207 int32_t t_rmshr; /* shared real memory */
208 int32_t t_armshr; /* active shared real memory */
209 int32_t t_free; /* free memory pages */